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media: allegro: fix potential null dereference on header 

The pointer header is an alias to msg and msg is being null checked.
However, if msg is null then header is also null and this can lead to
a null pointer dereference on the assignment type = header->type. Fix
this just using header->type after the null check and removing the need
for type as it is only used once.

Addresses-Coverity: ("Dereference before null check")

Fixes: 3de1683966 ("media: allegro: add explicit mail encoding and decoding")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Michael Tretter <m.tretter@pengutronix.de>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Colin Ian King 2020-07-22 15:09:03 +02:00 committed by Mauro Carvalho Chehab
parent dd4eddc4ba
commit 04320b3ef9
1 changed files with 1 additions and 2 deletions
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3
drivers/staging/media/allegro-dvt/allegro-mail.c
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@ -462,13 +462,12 @@ allegro_dec_encode_frame(struct mcu_msg_encode_frame_response *msg, u32 *src)
ssize_t allegro_encode_mail(u32 *dst, void *msg)
{
const struct mcu_msg_header *header = msg;
enum mcu_msg_type type = header->type;
ssize_t size;
if (!msg || !dst)
return -EINVAL;
switch (type) {
switch (header->type) {
case MCU_MSG_TYPE_INIT:
size = allegro_enc_init(&dst[1], msg);
break;